How to use Regex In Javascript
In this approach, we are using a manual tag matching method to validate XML using regex. The function validateFn uses a stack to keep track of opening and closing tags, ensuring they are properly nested. If all tags are matched correctly and the stack is empty at the end, the XML is considered valid; otherwise, it’s flagged as invalid.
Example: To demonstrate using the Tag Matching to validate XML in JavaScript.
const xmlString = `
<geeks>
<article>
<title>Introduction to JavaScript</title>
<author>GFG</author>
<published>2024-01-01</published>
</article>
</geeks>
`;
function validateFn(xmlString) {
let stack = [];
const regex = /<([^>]+)>/g;
let match;
while ((match = regex
.exec(xmlString)) !== null) {
if (match[1]
.charAt(0) === '/') {
if (stack.length === 0
||
stack.pop() !== match[1].slice(1)) {
return false;
}
} else {
stack.push(match[1]);
}
}
return stack.length === 0;
}
if (validateFn(xmlString)) {
console.log("XML is valid.");
} else {
console.log("XML is not valid.");
}
Output
XML is valid.
How to Validate XML in JavaScript ?
Validation of XML is important for ensuring data integrity and adherence to XML standards in JavaScript. There are various approaches available in JavaScript using which validation of the XML can be done which are described as follows:
Table of Content
- Using DOM Parser
- Using Tag Matching